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    Tach Setting for 2011 90hp Optimax

    I am trying to find info on manufacturer website... what is the tachometer setting for my 2011 90hp merc optimax ? can't find it anywhere online ??
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    Hydrofoil increased, rpm..should I change prop ?

    I just put a stringray hydrofoil on my 2011 90hp optimax and the tach in WOT went from 6000 to 6500 ... same top speed with a 19 prop. I don't want to run that high of rpm... should I change my prop ?
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